path: root/drivers/net/irda/stir4200.c

/*****************************************************************************
*
* Filename:      stir4200.c
* Version:       0.4
* Description:   Irda SigmaTel USB Dongle
* Status:        Experimental
* Author:        Stephen Hemminger <shemminger@osdl.org>
*
*  	Based on earlier driver by Paul Stewart <stewart@parc.com>
*
*	Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
*	Copyright (C) 2001, Dag Brattli <dag@brattli.net>
*	Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
*	Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
*
*	This program is free software; you can redistribute it and/or modify
*	it under the terms of the GNU General Public License as published by
*	the Free Software Foundation; either version 2 of the License, or
*	(at your option) any later version.
*
*	This program is distributed in the hope that it will be useful,
*	but WITHOUT ANY WARRANTY; without even the implied warranty of
*	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*	GNU General Public License for more details.
*
*	You should have received a copy of the GNU General Public License
*	along with this program; if not, write to the Free Software
*	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*****************************************************************************/

/*
 * This dongle does no framing, and requires polling to receive the
 * data.  The STIr4200 has bulk in and out endpoints just like
 * usr-irda devices, but the data it sends and receives is raw; like
 * irtty, it needs to call the wrap and unwrap functions to add and
 * remove SOF/BOF and escape characters to/from the frame.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/usb.h>
#include <linux/crc32.h>
#include <net/irda/irda.h>
#include <net/irda/irlap.h>
#include <net/irda/irda_device.h>
#include <net/irda/wrapper.h>
#include <net/irda/crc.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>

MODULE_AUTHOR("Stephen Hemminger <shemminger@osdl.org>");
MODULE_DESCRIPTION("IrDA-USB Dongle Driver for SigmaTel STIr4200");
MODULE_LICENSE("GPL");

static int qos_mtt_bits = 0x07;	/* 1 ms or more */
module_param(qos_mtt_bits, int, 0);
MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");

static int rx_sensitivity = 1;	/* FIR 0..4, SIR 0..6 */
module_param(rx_sensitivity, int, 0);
MODULE_PARM_DESC(rx_sensitivity, "Set Receiver sensitivity (0-6, 0 is most sensitive)");

static int tx_power = 0;	/* 0 = highest ... 3 = lowest */
module_param(tx_power, int, 0);
MODULE_PARM_DESC(tx_power, "Set Transmitter power (0-3, 0 is highest power)");

#define STIR_IRDA_HEADER  	4
#define CTRL_TIMEOUT		100	   /* milliseconds */
#define TRANSMIT_TIMEOUT	200	   /* milliseconds */
#define STIR_FIFO_SIZE		4096
#define FIFO_REGS_SIZE		3

enum FirChars {
	FIR_CE   = 0x7d,
	FIR_XBOF = 0x7f,
	FIR_EOF  = 0x7e,
};

enum StirRequests {
	REQ_WRITE_REG =		0x00,
	REQ_READ_REG =		0x01,
	REQ_READ_ROM =		0x02,
	REQ_WRITE_SINGLE =	0x03,
};

/* Register offsets */
enum StirRegs {
	REG_RSVD=0,
	REG_MODE,
	REG_PDCLK,
	REG_CTRL1,
	REG_CTRL2,
	REG_FIFOCTL,
	REG_FIFOLSB,
	REG_FIFOMSB,
	REG_DPLL,
	REG_IRDIG,
	REG_TEST=15,
};

enum StirModeMask {
	MODE_FIR = 0x80,
	MODE_SIR = 0x20,
	MODE_ASK = 0x10,
	MODE_FASTRX = 0x08,
	MODE_FFRSTEN = 0x04,
	MODE_NRESET = 0x02,
	MODE_2400 = 0x01,
};

enum StirPdclkMask {
	PDCLK_4000000 = 0x02,
	PDCLK_115200 = 0x09,
	PDCLK_57600 = 0x13,
	PDCLK_38400 = 0x1D,
	PDCLK_19200 = 0x3B,
	PDCLK_9600 = 0x77,
	PDCLK_2400 = 0xDF,
};

enum StirCtrl1Mask {
	CTRL1_SDMODE = 0x80,
	CTRL1_RXSLOW = 0x40,
	CTRL1_TXPWD = 0x10,
	CTRL1_RXPWD = 0x08,
	CTRL1_SRESET = 0x01,
};

enum StirCtrl2Mask {
	CTRL2_SPWIDTH = 0x08,
	CTRL2_REVID = 0x03,
};

enum StirFifoCtlMask {
	FIFOCTL_EOF = 0x80,
	FIFOCTL_UNDER = 0x40,
	FIFOCTL_OVER = 0x20,
	FIFOCTL_DIR = 0x10,
	FIFOCTL_CLR = 0x08,